... A4-21 Finish:Black,Passivated,Zinc Hexagon socket set screws with flat point DIN913Material:Stainless Steel,Carbon Steel,Alloy Steel1) ... Various kinds of set screws are available2) Can be made with different tensile strength3) Can be supplied with different finish, such as bright, zinc ... plated, black4) Can be made with different standards, such as ISO, DIN, ANSI, BS and ...